(i) natural resource — (e) water
reason: water is found in nature in abundance and is not synthesized synthetically by humans hence it is a natural product.
(ii) coal — (a) carbonization
reason: the process of conversion of dead vegetation into coal is called carbonization. In this way it is most appropriately related to coal
(iii) petrochemical product — (b) plastic chair
reason: petrochemicals are used in making plastics. So it is related closely to chair made of plastics
(iv) natural gas — (c) Krishna, Godavari delta
reason: Natural gas is found in India in this delta.
(v) petroleum — (d) plankton
reason : petroleum was formed by remnants of tiny organisms called plankton. Hence this is the answer that is most closely related with petroleum.
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